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Commit 09314799 authored by NeilBrown's avatar NeilBrown
Browse files

md: remove 'go_faster' option from ->sync_request() 



This option is not well justified and testing suggests that
it hardly ever makes any difference.

The comment suggests there might be a need to wait for non-resync
activity indicated by ->nr_waiting, however raise_barrier()
already waits for all of that.

So just remove it to simplify reasoning about speed limiting.

This allows us to remove a 'FIXME' comment from raid5.c as that
never used the flag.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 50c37b13

drivers/md/md.c

+2 −3
Original line number Diff line number Diff line
@@ -7820,8 +7820,7 @@ void md_do_sync(struct md_thread *thread) 
		if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))

			break;



		sectors = mddev->pers->sync_request(mddev, j, &skipped,

						  currspeed < speed_min(mddev));

		sectors = mddev->pers->sync_request(mddev, j, &skipped);

		if (sectors == 0) {

			set_bit(MD_RECOVERY_INTR, &mddev->recovery);

			break;
@@ -7898,7 +7897,7 @@ void md_do_sync(struct md_thread *thread) 
	wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));



	/* tell personality that we are finished */

	mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);

	mddev->pers->sync_request(mddev, max_sectors, &skipped);



	if (mddev_is_clustered(mddev))

		md_cluster_ops->resync_finish(mddev);

drivers/md/md.h

+1 −1
Original line number Diff line number Diff line
@@ -506,7 +506,7 @@ struct md_personality 
	int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev);

	int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev);

	int (*spare_active) (struct mddev *mddev);

	sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster);

	sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped);

	int (*resize) (struct mddev *mddev, sector_t sectors);

	sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks);

	int (*check_reshape) (struct mddev *mddev);

drivers/md/raid1.c

+1 −8
Original line number Diff line number Diff line
@@ -2480,7 +2480,7 @@ static int init_resync(struct r1conf *conf) 
 * that can be installed to exclude normal IO requests.

 */



static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster)

static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped)

{

	struct r1conf *conf = mddev->private;

	struct r1bio *r1_bio;
@@ -2533,13 +2533,6 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp 
		*skipped = 1;

		return sync_blocks;

	}

	/*

	 * If there is non-resync activity waiting for a turn,

	 * and resync is going fast enough,

	 * then let it though before starting on this new sync request.

	 */

	if (!go_faster && conf->nr_waiting)

		msleep_interruptible(1000);



	bitmap_cond_end_sync(mddev->bitmap, sector_nr);

	r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO);

drivers/md/raid10.c

+1 −7
Original line number Diff line number Diff line
@@ -2889,7 +2889,7 @@ static int init_resync(struct r10conf *conf) 
 */



static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,

			     int *skipped, int go_faster)

			     int *skipped)

{

	struct r10conf *conf = mddev->private;

	struct r10bio *r10_bio;
@@ -2994,12 +2994,6 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, 
	if (conf->geo.near_copies < conf->geo.raid_disks &&

	    max_sector > (sector_nr | chunk_mask))

		max_sector = (sector_nr | chunk_mask) + 1;

	/*

	 * If there is non-resync activity waiting for us then

	 * put in a delay to throttle resync.

	 */

	if (!go_faster && conf->nr_waiting)

		msleep_interruptible(1000);



	/* Again, very different code for resync and recovery.

	 * Both must result in an r10bio with a list of bios that

drivers/md/raid5.c

+1 −2
Original line number Diff line number Diff line
@@ -5050,8 +5050,7 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk 
	return reshape_sectors;

}



/* FIXME go_faster isn't used */

static inline sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster)

static inline sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped)

{

	struct r5conf *conf = mddev->private;

	struct stripe_head *sh;